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[Luc Scholtès <question706821@xxxxxxxxxxxxxxxxxxxxx>]

Question #706821 on Yade changed:
https://answers.launchpad.net/yade/+question/706821

    Status: Open => Answered

Luc Scholtès proposed the following answer:
Hello,

1) I'd say yes. You could even consider a JCFPM mat for the walls
assigning a different type to the sphere to have purely frictional
interactions between spheres and walls. For instance, walls' type=0 and
spheres' type=1 will define a purely frictional interaction between
spheres and walls with a friction angle equal to the minimum value you
assigned to both (if walls' friction angle = 0, then you will have
frictionless interactions between spheres and walls). The same logic can
be applied to the clumps if you wanted to have purely frictional
interactions between clumps (e.g., define type=n for each clump).

2) You can assign any loading to the walls but be careful not to apply
both displacement and force at the same time to avoid conflict in the
control. Also, I think you need to make them nonDynamic to avoid their
positions to be adjusted according to Newton's second law of motion. The
quasi-staticity is not really related to the way you apply the load but
more to the amplitude of the load vs. the system response. Not sure I
get your point here... Maybe you refer to oscillations you observe?

3) You'd need to define some custom functions. The JCFPM can track the
amount of cracks for each particle (and the degree of damage by relating
the amount of broken contacts to the initial number of bonds). If you
know which particle is within each clump, I guess you could assess their
degree of damage too. For that, you'd need to list your clumps and
assign them with the spheres ids.

Sorry for not getting into the details of your MWE but it is not exactly
Minimal. I hope I could help ANW.

Luc

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